The Interferons (IFNs) are a group of cytokines produced by vertebrates in response to various stimuli, including the presence of foreign nucleic acids in the body, bacteria, tumor cells and viral antigens. These proteins have significant shares immunomodulatory, antiproliferative and antiviral drugs, the first line of defense of the body. Once produced, the IFNs block viral replication, maximize the lytic activity of natural killer cells, increase the expression of MHC class I in cells infected by viruses and induce the development of Th1 cells The production of interferon alpha-2A is now held by biotechnology with the establishment of a chain of DNA producer of interferon alpha-2a in the chain of original DNA of a bacterium, allowing the bacteria produce this drug on an industrial scale. In the process of synthesis, the 165 amino acids that are part of this molecule can change in your order with no reduction in activity or changes in the properties.